Filter press



Jan. 22, 1941. H, mm 2 4 2,229,900

nun ms:

Filed July 29. 1930 3 Shuts-Shut 1 Inventor Heanra'c/z Rewz By His Aftomays 1941- I H. REJTZ 2,229,900

FILTER PRESS Filed July 29. 1939 3 anti-Shut 2 Inventor Hanna/a ReeltzBy His Afforqeys V I Jan. 28, 1941. j H. Rm'rz 2,229,900

Mum! mass Filod July 29, 1939 3 Shanta-Shunt 5 Jay. 4

Inventor flenm'oh Redd:

By His Attorneys Patented Jan. 28, 1941 FILTER PRESS Helinrich Reitz,Bitterfeld, Germany, assignor to G. Farbenindustrle Aktiengesellschait,

Frankfort-on-the-Maln, Germany Application July 29, 1939, Serial No.287,311

I In Germany November 16, 1931 3- Claims. (01. 100-50) This inventionrelates to improvements in or relating to illter presses and moreparticularly to a combined filter and hydraulic press and is acontinuation in .part of my co-pending applit cation, Serial No. 79,703,flied May 14, 1936, en-

titled Filter press. Said application, Serial No. 79,703, is in turn adivision of my application,

Serial No. 642,725 which has since matured into U. S. Patent No.2,048,352.

to In the said co-pending application, Serial No.

M21725 I have described and claimed a filter press comprising a base,heads at opposite ends thereof -rigidly secured to said base andprovided with integral extensions thereon directed in ls wardly towardseach other and in alignment, collars in sliding and sealing engagementwith the periphery of said extensions, the end face of each collar beingadapted to be moved into sealing engagement with the inner face ol thetill head; the collars being in alignment, hydraulically operated-meansoperatively connected to each collar for reciprocating the same, a ramslidably and sealingly engaged with the inner surface of each collar toform therewith and Ad with the head a filtering chamber, hydraulicallyoperated means positioned parallel to the first named hydraulic meansand adapted to recipro cate the rams, filters mounted on the inner faceof the extension and the outer face oi. the ram 30 in facing relationsto each other, means for the entry of a primary fluid to said chamberand another means to permit exit of a secondary fluid,

and means for operating the collar and the ram in proper sequence, saidcollar being moved over dd said ram and then with the ram to release thepress cake after 'a pressing operation has been completed.

Theinvention, the subject of the aforesaid copending application, thusprovides for the simultil taneous production of only one filter cake byeach press plunger, whilst the present invention is adapted for thesimultaneous production of two filter cakes by means oi one and the samepress plunger, and thus enables the output the filter press to beconsiderably increased.

To this end, by way of modification of the invention, the subject of myco-pending application, each filtering chamber is divided into twocompartments by means of an intermediate disk- 50 shaped member, 'bothends of which arealsb designed as filtering surfaces. It is the piilposeand object of' this invention to provide a-multicompartment press ofsuch construction.

In order more clearlyto understand the inven- 55 tion reference is madeto the accompanying drawings which illustrate diagrammatically, andbyway of example, an embodiment of a doubleacting filter press inaccordance therewith and in which:

.Flgure 1 is a longitudinal section with parts 5 broken away.

Figure 2 is a front elevation.

Figure 3 is a longitudinal partial section illustrating the press with.the filtering chambers open.

Figure 4 is a longitudinal section, illustrating the positions of themoving parts at the end of the filtering operation, and

Figure 5 is a longitudinal partial section of a modification of thepress.

on the drawings:

Reference numeral i designates the base or the press. The press issupplied at its opposite ends with heads ll rigidly secured to the base.Tie rods t (shown broken away in Figure l) unite til the press heads.

Centrally located in the press is the hydraulic press cylinder t, inwhich there operate oppositely moving rams ll. Port t provides for supply and exhausting the working fluid for the press cylinder.

Supported from and located above cylinder t is a smaller hydrauliccylinder ll. Cylinder it houses pistons t provided with connecting rodst. Pistons t are moved on their outstrolre by Bill fluid admittedthrough port it, and on their lnstroke by fluid admitted through port ll. Each pnrtis provided with conventional valve means (not disclosed).It will be appreciated that port it exhausts the working fluid, whileworking fluid is being supplied through port ill and vice versa.

Situated directly below cylinder 4 is another small hydraulic cylinder Hwhich houses pistons l3. 'Pistons l3 are provided with connecting rodsl. Ports l4 and I5, functioning in the 40 same may as ports in and II ofcylinder 1, are provided in cylinder l2. For reasons which will besubsequently understood, the effective surface of pistons i3 is lessthan the effective surface oiplstcns8.

Each ram 5 has an extension I! at its outer end. A rim or abutment I8 isprovided at the inner end of each extension.

Each head I of the press is provided with an extension I! facing a ramextension l1. The 50 ram and head extensions have the samecircumference.

An intermediate member. is movably located between each ram and head.Each intermediate member is constructed with an enlarged central portion2| and outer portions 22 and 22a facing a ram extension I! and a headextension I! respectively. The circumference of the outer portions ofeach intermediate member is the same as that of the ram and headextensions. It will be appreciated that the construction so fardescribed locates at each end of the press two filtering chambers I and,II respectively, chamber I being formed between a ram extension and anintermediate member, and chamber II between a head extension and inintermediate member.

The periphery of the so located filtering chambers is closed by collars23 and 25, each collar 23 being movable on the ram extension and anouter portion 22 of an intermediate member, and each collar 25 beingmovable on a head extension and an outer portion 22a of an intermediatemember. Each collar 23 is directly connected to a connecting rod 3 byelement 24. The movement of a piston 8 is therefore directly transmittedto a collar 23. On the other hand each collar 25 is directly connectedto a connecting rod l3 by fastening means 25a. Here again the motion ofa piston I3 is directly translated to a collar 25a.

There are provided near the lower end of the press guide rods 26. Therams, collars and intermediate members have carriages 21 fastenedthereto, said carriages being slidable on said rods 26. Said rams,collars and intermediate members are accordingly supported and guided intheir movement by said rods 26.

The face of each ram extension, of each outer portion of an intermediatememberand of each head extension is provided with a filtering screen 28.Filtrate produced during the filtering action is discharged through ramextensions I! by outlets 29, through intermediate members 28, by outlets29a, and through heads l3 by outlets 29b.

Each head 2 is centrally apertured at 30 to provide a passage forfeeding fluid to filtering chamber II. On the other hand, eachintermediate member is centrally apertured at 3| to provide means foregress of fluid from filtering chamber 11 to filtering chamber I. Fluidis supplied to P ssages 30 by inlets 32.

The supply of the medium to be filtered is controlled by thehydraulically operated controls 38a.

Each control comprises a hydraulic cylinder 35 in which a piston 36operates. 31 and 38 represent hydraulic fluid inlets and outlets for thecylinder.

Piston 36 has a connecting rod 34 which extends I through passage 30 andhas attached to its other end an ordinary piston valve 33. Valve 33 isseated in the aperture 33a, leading to filterin chamber II. Whenpressure is exerted on piston 38 by fluid admitted through port 31,valve 33 is unseated, whereupon the medium to be filtered feeds frompassage 30 to chamber II'and by way of passage 3| to chamber I.Subsequently when pressure is exerted on the piston by hydraulic fluidadmitted through port 38, valve 33 is again seated in aperture 33a.

Considering only one end of the press for the sake of simplicity, theoperation of the press will now be described. Let it be assumed that thepress is in the position shown in Figure 3, with ram 5 retracted intothe press cylinder 3, collar 23 drawn over ram extension l1 and intoengagement with rim I8, collar 25 resting on extension IQ of head 2 incontact with the abutting wall thereof, and intermediate member 28positioned midway between extension IQ of head 2 and extension II of ram5. In this position both filter-' ing chambers I and II are freelyaccessible. It will be understood that at this point piston 8 is at theend of its instroke, and piston |3 at the end of its outstroke. Port IUof cylinder 1 is now opened for fiuid supply and port II for fluiddischarge. Piston 8 is thereby caused to move toward the head causingcollar 23 to move in that direction until it slides over the outerportion 22 of the intermediate member and contacts with the enlargedcentral portion 2| of said interme the motion imparted by piston 8 ispossible be- 20 cause of the larger effective surface of piston 8.During the further movement of piston 8, ram 5 is operatedin the samevdirection. The press parts will thus have assumed the position shown inFigure 1, with filtering chambers I and II clearly defined. When thisposition has been attained, control 38a is operated to permit the mediumto be filtered to feed through inlet 32, passage 30 and aperture 33a,into filtering chamber II, andthrough aperture 3| into filterin chamberI. Control 38a is shut oil when the filtering chambers are filled.Hydraulic fluid is then fed to press cylinder 4 to operate ram 5 whichmoves the assembled parts to the right as a unit, causing compression ofthe material in the filtering chambers. The filtrate produced issues ithrough the outlets 29, 29a and 2912. At this point the parts are in theposition clearly illustrated in Figure 4. a When filtration iscompleted, the opening of the press is inauguratel by releasing thepressure on ram 5. Fluid is supplied through port l5 of cylinder l2, tofurther retract piston l3 and efiect retrograde movement of collar 25,and thus also of intermediate member 20, collar 23 and ram 5. Piston 8is then retracted by admission of fluid through port whereby collar 23is moved out of engagement; with the central portion 2| of intermediatemember 28 and over extension ll of the ram, while contact is effectedbetween the collar and rim |8 of the ram extension. At the same time themovement of piston I3 is reversed so as to move collar 25 over theextension IQ of head 2 into engagement with the abutting wall of saidhead. Further retraction of collar 23 through retraction of piston 8causes the ram to move further into cylinder 4. As a result of thisdisposition of the collars and ram, both press cakes are freelyaccessible and can be removed. The press has then returned to itsinitial position as illustrated in Figure 3.

It is to be understood that the mode of operation herein outlined ispurely illustrative, since because of the structure possessed by thepress, it' is possible to open and close the press by a differentsequence of steps than that described. Thus, for instance, in closingthe press instead of first positively actuating piston 8 and collar 23to the position of Figure 1, ram 5 may be first op- 70 'be operatedsimultaneously; As a further alternative instead of 'first retractingpiston 3 and 75 till ' ltis retractedln moving collar 25 then retractingpiston 8, piston v8 may be first retracted to engage with rim l8, andthen further moved to retract the ram and expose the illter cake inchamber I for removal. Therealter, piston I! may be retracted so as todisensaae member'20 from the filter cake in chamber ll, whereupon'byreversing the movement of piston it, so as to push collar 25 overextension l8 and into engagement with the abutting wall of the head, thefllter cake in chamber II is freely exposed for removal.

Figure 5 illustrates a modified form of the invention. In thismodification in lieu of cylinder it, two cylinders lza are provided,each located adjacent a head and in alignment with cylinder l. It willbe apparent that in this modification the operation will he the same asthat described,

ercept that the movements of piston l3a will be reversed. Thus toposition collar 25 so as to form filteringcha-mber II, piston i'3a ismoved forward instead oi! retracted. The same is true in movingintermediate member 20 to disenga e it llrom the filter cake. 0n theother hand, piston over the head extension to open the press.

it will be apparent that the construction of the filter press accordingto the present invention allows of a variety oi! modes of operation andthe appended claims whiledescribing such operation in eeneral terms arenot to be construed as llm-,

ited to any particular mode herein described.

I claim:

i. In a hydraulic press a base, a head to oneend of said base, ahydraulic cylinder disposed inwardly from and co-axial with said head, aram in said cylinder, press means intermediate said head and hydrauliccylinder consisting of an extension on said head having its tacodisposed toward said ram, 9. disk-shaped member having a central portionof greater diameter than said head extension and outer portions of thesame diameter as said head extension, a collar located between said headand said disk-shaped member, adapted to slidably and sealingly engagewith said head extension and the periphery 5 of the adjacent outerportionof said disk-shaped member and to seaiingly engage with its endface said central portion of said disk-shaped member, a second collarbetween said ram and said disk-shaped member similar to the first,adapted to slidingly and sealingly engage with said ram and the otherouter portion of said disk-shaped member and to sealingly engage withits end face said central portion of said diskshaped member, a secondhydraulic cylinder, a

piston in said second cylinder fixedly secured only to said secondcollar, a third hydraulic cylinder, a piston in said third cylinderfixedly secured only to said other collar, filters mounted on both facesoi said disk-shaped-member and 2 on the face of the extension of saidhead and of said ram, respectively, so as to form in conjunction withthe head extension, said collars, said disk-shaped member and said ram,filtering chambers, means ior the entry of a primary fluid to saidchambers and other means to permit exit 01' a secondary'fluid therefrom,the aforesaid elements being adapted to operate in such a manner that informing and opening said filtering chambers movement of said disk-shapedmember is exclusively caused by the movements of the pistons directlycontrolling the movements of said first and second c'ollars. 2. Thedevice defined in claim "1 wherein means are provided for guiding theram, collars and disk-shaped member when in motion.

3. The device defined in claim 1 wherein the disk-shaped member isprovided with an opening which connects the filtering chambers.

